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Spin resonance absorption of the triplet excitations is studiedexperimentally in the Haldane magnet PbNi2V2O8. The spectrum has features ofspin S=1 resonance in a crystal field, with all three components, correspondingto transitions between spin sublevels, being observable. The resonance field istemperature dependent, indicating the renormalization of excitation spectrum ininteraction between the triplets. Magnetic resonance frequencies and criticalfields of the magnetization curve are consistent with a boson version of themacroscopic field theory [Affleck 1992, Farutin & Marchenko 2007], implying thefield induced ordering at the critical field, while contradict the previouslyused approach of noninteracting spin chains.

Triplet spin resonance of the Haldane compound with interchain coupling